Startup Idea: Mobile App for Locking Screen During Video Chat

Startup idea to develop a mobile application that lets users lock their screen but continue video chatting. This prevents the accidental pressing of buttons or settings changes. The idea suggests the app can be unlocked using a sequence of keys. Potential use cases include personal chat and business meetings.

I am Self Employed so I am very flexible and use all sorts of Software every single day. My Private life includes many video chat sessions, and I realized the other day when talking to my Grand-Daughter who screams if she can't hold the phone, (She's 1) that we need some sort of app that can lock the screen but still continue to function when video chatting. This way she can hold the phone and talk with me, but she is not hitting buttons and disabling the session. My idea would be to use a sequence of keys, i.e. the power button + the Home screen key to lock and unlock the app. This not only would be useful for personal use, but also there are times I need to be able to position my phone for video or study purposes. This would come in handy so that I don't change any important settings during tasks. You could call it FreezeFrame, or BabyBuddy, or make a separate apps, personal and business, specifically developed for each to reach two audiences.